308149638 has 16 divisors (see below), whose sum is σ = 648736320. Its totient is φ = 97310376.

The previous prime is 308149637. The next prime is 308149661. The reversal of 308149638 is 836941803.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 308149638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (308149637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1351420 + ... + 1351647.

It is an arithmetic number, because the mean of its divisors is an integer number (40546020).

Almost surely, 2^308149638 is an apocalyptic number.

308149638 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

308149638 is an abundant number, since it is smaller than the sum of its proper divisors (340586682).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

308149638 is a wasteful number, since it uses less digits than its factorization.

308149638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2703091.

The product of its (nonzero) digits is 124416, while the sum is 42.

The square root of 308149638 is about 17554.1914652883. The cubic root of 308149638 is about 675.4406910961.

The spelling of 308149638 in words is "three hundred eight million, one hundred forty-nine thousand, six hundred thirty-eight".